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Hexachlorocyclotriphosphazene(Phosphonitrilic chloride trimer)

  • CAS No.


  • Molecular Formula :


  • Purity :


  • Appearance :

    White crystal powder

  • Annual capacity :

    60 Metric Ton/Month

  • Storage :

    Be airtight in a cool and dry environment

  • Packing :

    25 kg cardboard barrels

Free Sample
Application :

Due to the fluidity of the phosphorus-chlorine bond, chlorine can be easily replaced, and a series of phosphoronitrile derivatives with special properties are generated.Is the synthesis of halogen-free flame retardant, high temperature resistant materials intermediate raw materials, such as the production of phenoxyphosphazenes, p-carboxyphenoxyphosphazenes, polyurethane phosphazenes, hydrocarbon oxyphosphazenes and other flame retardants, polyphosphazenes elastomer materials.For this reason, a series of phosphazenes can be made.

Description :

Hexachlorocyclotriphosphazene is a high chlorine consuming product, which can be used as insecticide, fertilizer, antitumor drug, phase transfer catalyst, free radical polymerization initiator, light stabilizer, antioxidant, flame retardant, etc.It can also synthesize organic-inorganic polymer materials with more extensive functions through polymerization, which can be used in catalytic materials, high-temperature resistant rubber, flame retardant materials, polymer electrolyte, photoconductive polymer materials, nonlinear optical materials, biomedical polymer materials, polymer liquid crystal, separation film, medicine, military industry, etc.Due to its unique properties and high added value, the synthesis and application of polyphosphazenes are still a research hotspot, which requires further research and development of hexachlorocyclotriphosphazenes and polyphosphazenes.

Hexachlorocyclotriphosphazene is an inorganic compound with the formula (NPCl2)3. The molecule has a cyclic backbone consisting of alternating phosphorus and nitrogen atoms. It can be viewed as a trimer of the hypothetical compound N≡PCl2. Hexachlorocyclotriphosphazene together with the related (NPCl2)4 are precursors to inorganic polymers called polyphosphazenes.
Hexachlorocyclotriphosphazene Synthesis
The reaction of PCl5 and NH4Cl affords substances with the empirical formula PNCl2. Purification by sublimation gives mainly the trimer and tetramer (PNCl2)4. Slow sublimation under vacuum at approximately 60 °C affords the pure trimer, (PNCl2)3, free of the tetramer. These rings were described by Liebig in 1832 in his study of the reaction of PCl5 and NH3:
n PCl5 + n NH4Cl → (NPCl2)n + 4n HCl
Reactions are typically conducted in chlorobenzene solution.
Hexachlorocyclotriphosphazene Inorganic rings
Chemists have long known of rings containing carbon, e.g. benzene, pyridine, and cyclohexane. Related cyclic compounds lacking in carbon have also been studied. Hexachlorocyclotriphosphazene is one such inorganic ring. Other well known inorganic rings include borazine, S4N4, and the cyclic siloxanes.
Hexachlorocyclotriphosphazene "Inorganic rubber"
Hexachlorocyclotriphosphazene is a precursor to poly(dichlorophosphazene) or "inorganic rubber", whose discovery is attributed to H. N. Stokes in 1896. Upon heating to ca. 250 °C, the trimer undergoes ring-opening polymerization to give the linear polymer (PNCl2)n. Subsequent replacement of the chloride centers by other groups, especially alkoxides, yields many polyphosphazenes, some with commercial uses.

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